Pack or skip
Sunscreen for San Antonio in September
Verdict
Pack it
Sun still finds you at 91°F — UV doesn't care about temperature.
Why
San Antonio in September averages highs of 91°F, lows of 70°F, 7 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 91°F — UV doesn't care about temperature.